const city = {
    location: '张三',
    population: '100万',
};
const location = {
    longgitude: '115.937726',
    latitude: '28.55722'
}
// es6 reset 运算符 ...args
    // ... 展开运算符  实现合并效果
const hometown = {
    ...city,
    ...location
}
console.log(hometown);